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Structural Evolution of Rutile TiO_{2}(110)-(1×2) Reconstruction Driven by Oxygen-Promoted Titanium Migration.

Liuxi Chen1, Meiliang Ma1, Bingwei Chen1

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Surface titanium diffusion is key to TiO2 reconstruction. Oxygen-rich conditions promote Ti migration, altering surface structures from double-row to single-row or triple-row configurations, as confirmed by experiments.

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Area of Science:

  • Materials Science
  • Surface Science
  • Computational Chemistry

Background:

  • Surface reconstruction is crucial for material properties but challenging to study.
  • Understanding the kinetics of surface structural evolution is vital for materials design.
  • Titanium dioxide (TiO2) surfaces exhibit complex reconstructions.

Purpose of the Study:

  • To elucidate the kinetics of TiO2(110)-(1x2) surface reconstruction.
  • To uncover the role of surface titanium diffusion in structural evolution.
  • To establish a microscopic mechanism for rutile surface reconstruction.

Main Methods:

  • Machine-learning-based molecular dynamics simulations with well-tempered metadynamics.
  • In situ environmental transmission electron microscopy (ETEM).
  • Combining computational simulations with direct experimental observation.

Main Results:

  • Surface titanium diffusion is critical for TiO2(110)-(1x2) reconstruction.
  • Oxygen-deficient conditions stabilize the reconstruction with suppressed Ti migration.
  • Oxygen-rich conditions enhance Ti mobility, leading to structural transformations (double-row to single/triple-row).

Conclusions:

  • Oxygen incorporation promotes titanium surface diffusion and structural evolution.
  • A microscopic mechanism for rutile surface reconstruction kinetics is established.
  • Insights provided for controlled manipulation of surface structures in varying chemical environments.